You need a 20 gallon tall tank for you baby. Also lots of leaves, the silk kind with the suction cups, you should have 2, one on each side, as they hide during the day, they're nocturnal, meaning they eat at night. Are you using Repashy as the diet? They need protein, too, so small crickets would be fine for your crestie, 3 times a week, about 4-5.
They don't need any lights if the room they're in is 73F at least. If it's lower than that, get a night light & put it in a dome on top of the tank. I don't use anything on the bottom, I've found it easier to have just glass on the bottom. They also need a small water dish as they like to take baths. The max length a gecko gets is 8", so growing an inch since September is good, they're not full grown until they're 2.
I hope this helps, here are a few pics of my tank for Bunny, she's 8 years old.
Waiting for crickets, I just them with Repashy as Bunny doesn't eat Repashy on her own:
She also has a stick that she loves to climb:
Sitting on her hide:
I have to go & couldn't find a pic of Bunny's tank, but hope this help you out a bit.